Home

What is the correct answer?

4

The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

A. α = 45° + φ/2

B. α = 45° - φ/2

C. α = 90° + φ

D. α = 90° - φ

Correct Answer :

B. α = 45° - φ/2


Related Questions

It is required to connect two parallel shafts, the distance between whose… When a shaking force is transmitted through the springs, damping becomes… The example of rolling pair is Ball and a Socket forms a In a screw jack, the effort required to lower the load W is given by The maximum frictional force, which comes into play, when a body just… In order to balance the reciprocating masses, The indicator using Watt mechanism is known as The relation between number of pairs (p) forming a kinematic chain and… The minimum periodic time of a compound pendulum is A spring controlled governor is found unstable. It can be made stable… When a point at the end of a link moves with constant angular velocity,… Cross head and guides form a Relationship between the number of links (L) and number of pairs (P) is The maximum velocity of a particle moving with simple harmonic motion… In a simple harmonic motion, the velocity vector with respect to displacement… In the below figure, PC is the connecting rod and OC is the crank making… For the same lift and same angle of ascent, a smaller base circle will… The efficiency of a screw jack is maximum, when (where α = Helix… Klein's construction can be used to determine acceleration of various… The condition for correct steering of a Davis steering gear is (where… In a cam drive with uniform velocity follower, the sharp corners of the… The velocity of any point in mechanism relative to any other point on… Rectangular bar in a rectangular hole is the following type of pair What is the number of instantaneous centres for an eight link mechanism? A slider crank chain consists of following numbers of turning and sliding… In which of the following type of gear train the first gear and the last… When the sleeve of a Porter governor moves downwards, the governor speed When two pulleys of different diameters are connected by means of an open… For a twin cylinder V-engine, the crank positions for primary reverse…